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Proceedings Paper

Compact sub-mW mid-infrared DFG laser source using direct-bonded QPM-LN ridge waveguide and laser diodes
Author(s): Osamu Tadanaga; Yoshiki Nishida; Tsutomu Yanagawa; Katsuaki Magari; Takeshi Umeki; Masaki Asobe; Hiroyuki Suzuki
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Paper Abstract

We report compact sub-mW mid-infrared (IR) laser sources based on difference frequency generation (DFG) in a quasiphase matched (QPM) LiNbO3 (LN) waveguide directly pumped with two laser diodes (LDs). The mid-IR lasers operate in the cw mode at ambient temperatures, and can be used for the tunable diode laser absorption spectroscopy (TDLAS). To construct the mid-IR laser sources, we employed a fiber-pigtailed wavelength conversion module, which we spliced to a direct-bonded QPM-LN ridge waveguide by using the V-groove connection technique. The modules had high external conversion efficiencies of 10 and 16 %/W for 3.4 and 2.6 &mgr;m, respectively. The signal was obtained from a 1.55-&mgr;m-band distributed feedback (DFB)-LD, and the pump from a single-mode LD stabilized with a fiber-Bragg-grating (FBG). We used 1.064 and 0.976-&mgr;m pump LDs for 3.4 and 2.6-(micron)m generation, respectively. The two LDs and the wavelength converter were assembled with a polarization maintaining fiber, and then packaged in a box. We obtained high outputs of up to 0.20 mW for the 3.4-&mgr;m laser source and 0.33 mW for the 2.6-&mgr;m laser source, and detected CH4 and H2O absorption lines with the 3.4 and 2.6-&mgr;m laser light sources, respectively.

Paper Details

Date Published: 14 February 2007
PDF: 8 pages
Proc. SPIE 6455, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI, 64550D (14 February 2007); doi: 10.1117/12.699753
Show Author Affiliations
Osamu Tadanaga, NTT Corp. (Japan)
Yoshiki Nishida, NTT Corp. (Japan)
Tsutomu Yanagawa, NTT Corp. (Japan)
Katsuaki Magari, NTT Corp. (Japan)
Takeshi Umeki, NTT Corp. (Japan)
Masaki Asobe, NTT Corp. (Japan)
Hiroyuki Suzuki, NTT Corp. (Japan)

Published in SPIE Proceedings Vol. 6455:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI
Peter E. Powers, Editor(s)

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